Question
Given an array of strings, group anagrams together.
For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"],
Return:
[
["ate", "eat","tea"],
["nat","tan"],
["bat"]
]
Solution
TODO
Code
class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Map<String, List<String>> map = new HashMap();
List<List<String>> results = new ArrayList();
for(int i=0; i<strs.length; i++) {
String key = getSortedString(strs[i]);
if(!map.containsKey(key)) {
List newList = new ArrayList<String>();
results.add(newList);
map.put(key, newList);
}
map.get(key).add(strs[i]);
}
return results;
}
public String getSortedString(String s) {
char[] ar = s.toCharArray();
Arrays.sort(ar);
return String.valueOf(ar);
}
}
Performance
TODO